CVE-2021-30817: Apple macOS

Medium severity, CVSS 5.5. EPSS: 0.6% chance of exploitation in the next 30 days.

A permissions issue was addressed with improved validation. This issue is fixed in macOS Big Sur 11.5. A malicious application may be able to access data about the accounts the user is using Family Sharing with.

Affected products

• Apple macOS: before 11.5 (fixed in 11.5)

Published 2021-10-28. Last modified 2026-06-17.